Electric gas-lighting apparatus



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7 G D. BANOROPT. ELECTRIC GAS LIGHTING APPARATUS.

No. 247,737. Patented Oct. 4,1881.

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(No Model.) I 2 Sheet-heet 2. G. D. BANUROFT.

ELECTRIC GAS LIGHTING APPARATUS. No. 247,737. A M Patented 001;. 4,1881.

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GEORGE D. BANGROFT, OF BOSTON, MASSACHUSETTS.

ELECTRIC GAS-LIGHTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 247,737, dated October4, 1881.

' Application filed August 1, 1881, (No model.)

To all whom it may concern:

Be it knownt-hat I, GEORGE D. BANoRoFT, of Boston, in the State ofMassachusetts, have invented a new and useful Improvement in ElectricGas-Lighting Apparatus, of which the following is a specification.

The invention relates to an electrically-com trolled mechanism forlighting and extinguishing gas, the principal feature of which is athermo-spring acting at the temperature of the atmosphere in onedirection to open the gascock, but when heated by the flame of the gasactingin the contrary direction to close the gas-cock, substantially asdescribed in my Patent No. 205,032.

It sometimes happens that the gas is extinguished accidentally at one ormore of the burners in a circuit before it is-turned oft throughout thecircuit by the proper operation of the electro-mechanism, and when thisis the case atany particularburner the thermo-spring at that burner,being no longer in the flame,

' thermo-spring itself when it has become cool to move it suflicientlyin to close the gas-cock.

The apparatus to which I have applied the the proper direction presentinvention, as shown in the drawings,

my invention, the gas-cock closed and the thermo-spring at thetemperature of the atmosphere. Fig. 2 is a front elevation of the same,but with the gas-cock open and the thermo-spring at the temperature ofthe atmosphere, the gas having been accidentally extinguished withoutclosing the cock. Fig. 3 is a side elevation of the apparatus in thecondition shown at Fig. 2, the rod K, however,in section.

A is the burner; B, its cock, having at its forward end, outside of theburner, a segmentarm, 0, by which it is turned. The cock B, between theburner and the segment-arm O, for a purpose to be described is cut awayso that a cross-section of the part remaining is a sector of a circle,as shown at :0.

D is an electro-magnet, in construction and mode of operation like theelectro-magnet described and shown in my said Patent N 0. 239,014, beinga cylindrical box of iron with a hollow core, around which is wound awire. The core (not shown) is threaded at the upper end to receive thegas-burner, and at thelower end to screw upon the gas-pipe.

E is the armature, hinged to the box, as shown, and when the magnet isdemagnetized kept up by a spring, 8. The armature E has a large hole topermit the passage of the burner A and two small holes, through whichpass two stiff heavy wires, w 20 which are united near the gas-tip by aplatinum wire, 19, The other ends of the wires 'w 10 are connected withthe line, the coil of the electro-magnet being in the wire 10.

Gr is a thermo-sprin g, supported at one end by an arm, m, extendingfrom the cylindrical box, and having its other end clamped in a block,f,sliding upon a rod, g, which, in turn, slides in a bracket, Z, upon thecylindrical box, and which at its inner end is attached to a crank-pin,a, on the segment-arm U. The rod 9 is threaded and carries twoadjustable nuts, 01/ n limiting its motion in the bracket 1, n n beingtwo other nuts on said arm, for a purpose which will appear.

J is a spring coiled around one sleeve, t, and within a second sleeve,t, in the arm g, as shown. The sleeves are merely for the prootheragainst the nut a.

moves on the arm g from the nut n it compresses the spring against thenut a", and if then the blockf continues to move under the force of thethermo-spring the arm 1 is carried outward, moving with it thesegment-arm C. If, after the spring J is compressed, the block fis heldstationary in a manner which will hereinafterappear, and the arm g isallowed to move through the blockf, the springJ, acting against the nuta under the resistance of the nut n will in turn carry the arm 9 outwardand with the movement of the arm turn the segment arm 0 outward.

K is a rod loosely pivoted at one end to the blockf, and having near itsother or free end, upon the upper side, a cam-shaped projection, e, andupon the lower side a notch, 7.". The free end of the rod K rests uponthe catch 00, which in a certain position locks in the notch k of therod K, while in all other positions it allows the rod K to slide over itin either (lirection.

The segment-arm O has two shoulders, c and c, and the armature E has aprojection, 1), against which one of the shoulders c c catches when thearmature is lifted by the spring 8. The armature carries also a yoke,T,an adj ustable set-screw, o, in which reaches far enough down tostrike the cam-projection a when the armature is in contact with itsmagnet.

The pressure of the thermo-spring is inward at ordinary temperatures ofthe atmosphere, and outward when heated by the flame of the gas. In thenormal condition of the apparatus the thermospring is cold, and theshoulder 0 of the segment-arm O rests upon the projection I). In thiscondition of the apparatus the cock is closed and the angle of the catch:20 points upward, the rod K resting lightly upon it.

The operation is as follows: A single impulse sent through the linecauses the magnet D to attractits armature E, and thereby rcleases theshoulder c from the projection 11. The thermo-spring,being cold, andacting upon the nut a on the arm g, presses the segmentarm 0 inward,opening the gas-cock B and turning catch w to the position shown in Fi2. The wire 1) in the meantime is broughtto a white-heat and lights thegas. The current is then broken, and the armature rising, the shoulder cis caught upon the projection b and the cock kept open. The gascontinuing to burn, the thermo-springbecomes heated, and, pressingoutward, closes the spring J upon the nut a and draws the rod K outwarduntil the notch looks with the catch an, the locking taking placejustwhen the spring J is closed. If now the gas has continued to burn asecond impulse sent over the line will release the shoulder c from theprojection b, and the thermo-spriug, continuing to press outward, willcarry the arm 9 still farther outward and turn off the gas; but if thegas has been accidentally extinguished any considerable length of timebefore the second impulse is sent over the line, the second impulse willthen release the shoulder c from the projection 12, and now thethermo-spring, although cold, cannot press inward, since the notch 70 islocked upon the catch or. The arm g, however, is free to move throughthe block f, which is driven by the thermo-spring G against the nut aand the spring J accordingly, acting against the nut a under theresistance of the nut a carries the rod outward and turns off the gas.

It is obvious that the catch or and notch k must unlock when the arm 9begins to move outward and to turn the gas-cock. In order, therefore,that the rod K may continue to furnish suificient resistance to thethermo-sprin g for the operation just described, even if the spring J issluggish in its movement, the setscrew 0 in the yoke T is adjustable tostrike the upper part of the cam-projection e on the rod K at the momentthe unlocking takes place, thereby binding or clamping the rod betweenthe moving catch a; and the set-screw 0, and furnishing a resistance tothe thermo-spring.

The cam-projection e is cut away on the top, as shown, in order to letit pass freely under the set-screw when the armature is attracted to theelectro-magnet for the purpose of disengaging shoulder c and engagingshoulder c with the catch I).

I claim 1. In an electrical gas-lighting apparatus. substantially asdescribed, the combination of the catch or, notched rod K, and spring Jwith the gas-cock B, thermo-spring G, and arm g, for the purposespecified.

2. The burner and electric apparatus, substantially as described, incombination with the catch 00 upon the gas-cock, the yoke T, with itsset-screw 0, the segment-arm O, with shoulders c c, the thermo-spring G,the arm 9, provided with proper stops or nuts, the spring J, rod K,notch 70, and cam-projection c, for the purpose specified.

GEORGE D. BANCROFT.

Witnesses:

W. W. SWAN, H. G. OLMSIED.

